The 1137 Differential Pressure Sensor is a dual ported air pressure sensor that measures the pressure difference between the two ports. It can measure both positive and negative pressure from –7 kPa to +7 kPa.
|This sensor is designed to measure the pressure of clean, non-condensing air. Contact with moist air (i.e, human breath), dusty air, or other gases can damage the sensor.|
|Sensor Type||Gas Pressure (Differential)|
|Controlled By||VoltageRatio Input|
|Sensor Output Type||Ratiometric|
|Pressure Differential Min||-7 kPa|
|Pressure Differential Max||7 kPa|
|Case Pressure Max||75 kPa|
|Pressure Resolution||17 Pa|
|Measurement Error Max||± 5 %|
|Warm-up Time||20 ms|
|Response Time Max||1 ms|
|Supply Voltage Min||4.8 V DC|
|Supply Voltage Max||5.3 V DC|
|Current Consumption Max||10 mA|
|Output Impedance||1 kΩ|
|Output Voltage Min||500 mV DC|
|Output Voltage Max||4.5 V DC|
|Operating Temperature Min||-40 °C|
|Operating Temperature Max||125 °C|
|Recommended Tubing Size||3⁄32″|
|Date||Board Revision||Device Version||Comment|
|Oct 2012||0||N/A||Product Release|
Welcome to the 1137 user guide! In order to get started, make sure you have the following hardware on hand:
Next, you will need to connect the pieces:
Now that you have everything together, let's start using the 1137!
In order to demonstrate the functionality of the 1137, we will connect it to the 1018, and then run an example using the Phidget Control Panel on a Windows machine.
The Phidget Control Panel is available for use on both macOS and Windows machines. If you would like to follow along, first take a look at the getting started guide for your operating system:
Linux users can follow the getting started with Linux guide and continue reading here for more information about the 1137.
After plugging in the 1137 into the 1018, and the 1018 into your computer, open the Phidget Control Panel. You will see something like this:
The Phidget Control Panel will list all connected Phidgets and associated objects, as well as the following information:
The Phidget Control Panel can also be used to test your device. Double-clicking on an object will open an example.
Double-click on a Voltage Ratio Input object in order to run the example:
General information about the selected object will be displayed at the top of the window. You can also experiment with the following functionality:
The 1137 uses bipolar processing to provide an accurate, high level analog input signal that is proportional to the applied pressure. When the sensor is plugged in, the sensor voltage should default to about 2.5V, which corresponds to 0 kPa between the two ports.
The sensor comes with a positive top port and a negative bottom port. These ports have a diameter of 2.79mm to 3.30 mm (nominal 3mm). For hosing, we recommend using polyurethane tubing. We have had good results with 2.4mm ID tubing from EMI. In imperial measurement, 3/32” ID tubing is equivalent. This is available through laboratory supply stores such as Cole Parmer.
The Phidget libraries automatically convert voltage to pressure (kPa). See the Phidget22 API for more details. The Formula to translate voltage into pressure is:
Note: 1.0 kPa = 0.145 psi
The Phidget Cable is a 3-pin, 0.100 inch pitch locking connector. Pictured here is a plug with the connections labelled. The connectors are commonly available - refer to the Analog Input Primer for manufacturer part numbers.
This sensor can be read by any Phidget with an Analog Input or VINT Hub port. It will connect to either one using the included Phidget cable. VINT Hub ports can behave just like Analog Inputs, but have the added flexibility of being able to be used as digital inputs, digital outputs, or ports to communicate with VINT devices. For more information about VINT, see the VINT Primer.
|Image||Part Number||Price||Number of Voltage Inputs||Voltage Input Resolution|
|HUB0000_0||$30.00||6 (Shared)||* 16 bit|
|SBC3003_0||$120.00||6 (Shared)||* 16 bit|
This sensor comes with its own Phidget cable to connect it to an InterfaceKit or Hub, but if you need extras we have a full list down below. You can solder multiple cables together in order to make even longer Phidget cables, but you should be aware of the effects of having long wires in your system.
|Image||Part Number||Price||Sensor Type||Pressure Min||Pressure Max||Pressure Differential Min||Pressure Differential Max||Pressure Resolution|
|1126_1||$32.00||Gas Pressure (Differential)||—||—||-25 kPa||25 kPa||55 Pa|
|1136_0||$32.00||Gas Pressure (Differential)||—||—||-2 kPa||2 kPa||5 Pa|
|1137_0||$32.00||Gas Pressure (Differential)||—||—||-7 kPa||7 kPa||17 Pa|
|1138_0||$32.00||Gas Pressure (Differential)||—||—||0 Pa||50 kPa||56 Pa|
|1140_0||$32.00||Gas Pressure (Absolute)||20 kPa||400 kPa||—||—||413 Pa|
|1141_0||$32.00||Gas Pressure (Absolute)||15 kPa||115 kPa||—||—||111 Pa|
|PRE1000_0||$15.00||Gas Pressure (Absolute)||50 kPa||110 kPa||—||—||250 mPa|